Example 2 - Advanced SQL Engine - Teradata Database

SQL Operators and User-Defined Functions

Product
Advanced SQL Engine
Teradata Database
Release Number
17.00
Published
September 2020
Language
English (United States)
Last Update
2023-04-27
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dita:id
B035-1210
lifecycle
previous
Product Category
Teradata Vantage™

This example shows a user-defined aggregate function with an input parameter named parameter_1 declared as VARIANT_TYPE data type. The SELECT statement calls the new function using the NEW VARIANT_TYPE expression to create a dynamic UDT with two attributes named a and b.

CREATE TYPE INTEGERUDT AS INTEGER FINAL;
CREATE FUNCTION udf_agch002002dynudt (parameter_1  VARIANT_TYPE)
RETURNS INTEGERUDT CLASS AGGREGATE (4) LANGUAGE C  NO SQL
EXTERNAL NAME   'CS!udf_agch002002dynudt!udf_agch002002dynudt.c'
PARAMETER STYLE SQL;
SELECT udf_agch002002dynudt(NEW VARIANT_TYPE (Tbl1.a AS a,
                                             (Tbl1.b + Tbl1.c) AS b))
FROM Tbl1;